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1 /* Copyright (C) 2005-2020 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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111
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4 This file is part of the GNU Offloading and Multi Processing Library
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5 (libgomp).
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6
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7 Libgomp is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 /* Provide target-specific access to the futex system call. */
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27
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28 #ifndef SYS_futex
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29 #define SYS_futex 394
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30 #endif
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31
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32
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33 static inline void
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34 futex_wait (int *addr, int val)
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35 {
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36 register long sc_0 __asm__("$0");
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37 register long sc_16 __asm__("$16");
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38 register long sc_17 __asm__("$17");
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39 register long sc_18 __asm__("$18");
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40 register long sc_19 __asm__("$19");
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41
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42 sc_0 = SYS_futex;
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43 sc_16 = (long) addr;
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44 sc_17 = gomp_futex_wait;
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45 sc_18 = val;
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46 sc_19 = 0;
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47 __asm volatile ("callsys"
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48 : "=r" (sc_0), "=r"(sc_19)
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49 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
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50 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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51 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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52 if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS)
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53 {
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54 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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55 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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56 sc_0 = SYS_futex;
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57 sc_17 &= ~FUTEX_PRIVATE_FLAG;
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58 sc_19 = 0;
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59 __asm volatile ("callsys"
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60 : "=r" (sc_0), "=r"(sc_19)
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61 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18),
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62 "1"(sc_19)
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63 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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64 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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65 }
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66 }
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67
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68 static inline void
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69 futex_wake (int *addr, int count)
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70 {
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71 register long sc_0 __asm__("$0");
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72 register long sc_16 __asm__("$16");
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73 register long sc_17 __asm__("$17");
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74 register long sc_18 __asm__("$18");
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75 register long sc_19 __asm__("$19");
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76
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77 sc_0 = SYS_futex;
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78 sc_16 = (long) addr;
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79 sc_17 = gomp_futex_wake;
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80 sc_18 = count;
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81 __asm volatile ("callsys"
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82 : "=r" (sc_0), "=r"(sc_19)
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83 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
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84 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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85 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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86 if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS)
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87 {
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88 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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89 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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90 sc_0 = SYS_futex;
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91 sc_17 &= ~FUTEX_PRIVATE_FLAG;
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92 __asm volatile ("callsys"
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93 : "=r" (sc_0), "=r"(sc_19)
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94 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
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95 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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96 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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97 }
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98 }
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99
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100 static inline void
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101 cpu_relax (void)
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102 {
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103 __asm volatile ("" : : : "memory");
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104 }
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